Math teacher Stacey Roshan creates video lectures that her students watch at home or on mobile devices. Photo by Mike Fritz/ PBS NewsHour Stacey Roshan, a math teacher at the Bullis School in ...

And to test the external-storage hypothesis, for the third study they gave students the opportunity to review their notes in between the lecture and test.

These findings hold important implications for students who use their laptops to access lecture outlines and notes that have been posted by professors before class.

New study of undergraduate STEM courses finds that lectures remain dominant -- despite finding after finding questioning their effectiveness.